Flow voids on MRI indicate normal blood flow in major brain vessels, typically a positive sign. Post-concussion symptoms like memory and focus problems can persist for months due to brain injury effects. It is important to monitor symptoms and discuss them with your healthcare provider. I'm Newbie to control system for HVAC,so here i'm struggling with k-factor VAV boxes, how to find the k-factor,? what are the required datas to find k-factor. (i'm using inbuilt VAV controller from trend system) which asking k-factor for correct airflow. they calculated air flow by air flow=. Does that mean before or after? Try to think of it in context of the word - stream. A mountain stream flows down hill. Air flows in the direction the blower motor points. If you are going upstream in water, you are going against the current (uphill). If you are going upstream in air, you are going against the direction the air is flowing. What does the manufacturer say about their grilles? If you look at the Hart & Cooley catalog, it’s easy to see that these simple calculations don’t quite work. Take a look at the table below (see Image 3) and you’ll see what I mean. 20″ x 18″ isn’t in the table, but 20″ x 20″ is. And it doesn’t make the grade. When I say it’s the “standard” rating system, I mean it. This rating system is defined in an ASHRAE standard (52.2), which specifies the conditions under which the testing must be done and the performance required to meet each MERV level. Higher-MERV filters remove more particles from your air. They also remove smaller particles. An artery described as 'widely patent' means it is generally open, allowing blood flow. However, 'significant stenosis' indicates a notable narrowing in a segment of the artery that can restrict blood flow. Both terms can coexist if most of the artery remains open but a specific area has substantial narrowing. This condition may require further evaluation through imaging and consultation with. The phrase 'flow voids are grossly patent' on a brain MRI means that major blood vessels appear open and unobstructed, which is a normal finding. This suggests no significant blockage or abnormal blood flow in those vessels. Lightheadedness and dizziness can have many causes; this MRI result helps rule out vascular blockages. But what does duct size do to static pressure drops? Static pressure drops, equivalent lengths, and velocity Static pressure drops are the key quantity to worry about with moving air through ducts for a simple reason. The continuity equation tells us that the air flow rate stays constant from one part of a duct to another. Customer: My water meter has a small red water flow indicator that moves very slowly when no water is being used in the house. I turned off the main valve to the house, and the meter stopped turning, indicating that the leak is inside the house rather than between the meter and the house outside. I also turned off all water valves in the house, including the ice maker, yet the little red. Hello, I got the following problem: There is a differential pressure flowswitch across a shell and tube evaporater. Everytime the unit has been off for a while and you try to start it again, it goes out on flow. I changed out the flowswitch, but it still does that. When I measure the contacts.